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authorLinus Torvalds <torvalds@linux-foundation.org>2024-12-09 10:00:25 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2024-12-09 10:00:25 -0800
commit32913f348229c9f72dda45fc2c08c6d9dfcd3d6d (patch)
treedf435b6aee8d7d484c12d7004546603541ab20bd /kernel/bpf/core.c
parentfac04efc5c793dccbd07e2d59af9f90b7fc0dca4 (diff)
futex: fix user access on powerpc
The powerpc user access code is special, and unlike other architectures distinguishes between user access for reading and writing. And commit 43a43faf5376 ("futex: improve user space accesses") messed that up. It went undetected elsewhere, but caused ppc32 to fail early during boot, because the user access had been started with user_read_access_begin(), but then finished off with just a plain "user_access_end()". Note that the address-masking user access helpers don't even have that read-vs-write distinction, so if powerpc ever wants to do address masking tricks, we'll have to do some extra work for it. [ Make sure to also do it for the EFAULT case, as pointed out by Christophe Leroy ] Reported-by: Andreas Schwab <schwab@linux-m68k.org> Cc: Christophe Leroy <christophe.leroy@csgroup.eu> Link: https://lore.kernel.org/all/87bjxl6b0i.fsf@igel.home/ Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/bpf/core.c')
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